MINIMIZING NETWORK BANDWIDTH FOR TDM CES

摘要

A method and system are provided for reducing bandwidth usage in TDM CES systems. When a transmitting router receives a signal that the status of the access circuit is other than “normal”, and that therefore any TDM data arriving over the access circuit is not valid, the transmitting router signals a receiving router at the far end of a TDM Pseudowire that no packets for the TDM Pseudowire will be sent, and does not send any packets over the TDM Pseudowire, not even packets with empty payloads. When the receiving router receives such a signal, it starts to generate its own packets for placing in its jitter buffer. Valid packets already within the jitter buffer are played out to the access port, but once this runs out dummy packets placed in the jitter buffer by the router are played out. In this way, the jitter buffer maintains its fill level even when no packets are being sent across the TDM Pseudowire. Only when the transmitting router receives notification that the status of its access circuit has returned to normal does the transmitting router signal the receiving router that status has returned to normal, and begins sending packets once again. The method and system thereby reduce the bandwidth usage in TDM CES systems by refraining from needlessly sending meaningless packets over the TDM-Pseudowire.

主权项

1. A method of reducing bandwidth usage in a TDM-PW (time division multiplexing pseudowire), comprising:
receiving notification at a transmitting router that the status of an access circuit for the TDM-PW is other than normal; signaling from the transmitting router to a receiving router that no packets corresponding to the TDM-PW will be sent; refraining from transmitting packets over the TDM-PW; at the receiving router, upon receipt of a signal from the transmitting router that no packets corresponding to the TDM-PW will be sent:
generating packets; andplacing the generated packets in a jitter buffer of the receiving router.